The clinical manifestations of oliguric acute renal failure are divided into the following aspects: 1. decreased urine output: generalized edema or lower limb edema, resulting in damage to multiple organs; 2. digestive system symptoms: manifested as nausea, vomiting, poor appetite, etc.; 3. acidosis: acute metabolic acidosis; 4. cardiovascular symptoms: if toxins cannot be excreted, hyperkalemia, bradycardia, cardiac arrest, etc.; 5. neurological symptoms: toxins, creatinine, and urea are too high in the body, which can lead to coma, drowsiness, convulsions, uremic encephalopathy, etc.